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    Kaypro II floppy mod ?

    Hello.

    Before a few weeks, i bought Kaypro II (not 2), the first version. Normally, it has 2 Tandon single sided double density floppy drives. But this one had 2 Shugarts SA465 double sided quad...
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    I took a look the the imsai pictures. Is the...

    I took a look the the imsai pictures. Is the first time i´ve seen a power supply looks similar to my imsai´s one and it has the old frontpanel pcb color. What is the serial number of this Imsai ? I...
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    Looking for 5.25“ alignment disk.,

    Hello.

    I am looking for an 5.25“ analog alignment disk Dysan 224/2a or equivalent to adjust my tandon tm100-2a floppy drives properly.
    Perhaps, anybody can sell me alignment disk ?!


    Thx
    ...
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    Shugart SA450...

    Hello.

    I have got a shugart SA450. Can anybody help with a repair manual with wiring diagram ? The floppy drive is in a nice condition, but not working. I adjusted the revolutions on drive motor...
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    I have also got a kaypro and i was on same...

    I have also got a kaypro and i was on same situation. You need CPM 2.2G. Take a look to the manual:

    http://bitsavers.informatik.uni-stuttgart.de/pdf/kaypro/1484-C_Kaypro_Technical_Manual_Aug84.pdf...
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    Lotharek is in Poland. They make nice hardware...

    Lotharek is in Poland. They make nice hardware for vintage computers, great hardware for Atari 8 bit for example. They have a disk drive emulation system. Fits to 3,5" Floppydrive mounting slot, but...
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    You need second computer with a floppy and the...

    You need second computer with a floppy and the programm 22disk. With this program you can format different types of disk formatting architectures. And the just write the files to the disk. I am using...
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    Now, a logic 74ls244 was damaged. It was ok when...

    Now, a logic 74ls244 was damaged. It was ok when i tested these days. I had new on in stock. I swapped the chip and now, it goes to track00 automatically before format, read and write. But the head...
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    Versafloppy 1 Seek Error..

    Hello.

    Before a few weeks, i´ve got my Imsai. I rebuilt it, it works and looks really nice. I have got a monitor dump to transfer intel hex files from my main PC to the Imsai. Then, i wrote...
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    I loaded this zmac assembler ! That is exactly i...

    I loaded this zmac assembler ! That is exactly i was looking for ! Great ! I wrote a new Bios, i assembled the distribution CP/M code, i learned to work with macros library and now, i am not able to...
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    Thank you very much ! So, first i changed from...

    Thank you very much !

    So, first i changed from sta 1 to shld 1. Then, i cleared memory, wrote CP/M to memory, saved on disk and then i wrote my bootstrap. I started the system and i´ve got an "A>"...
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    Yes, it is 3740 IBM format. But it is 5.25"...

    Yes, it is 3740 IBM format. But it is 5.25" single sided single density. 35 Tracks, 18 Sectors, 128 byte/sector = 80kilobyte. I am using 48tpi disks which i am also using on IBM XT, Commodore 64,...
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    Imsai 8080 CP/M install problems..

    Hello.

    I´ve got an Imsai 8080 and i rebuilt it last month. It has original 8080 processor card, versafloppy 1 floppy controller, interfacer 1 serial card and 2 salota mixed memory card. It has...
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    Thank you ! i have read the manual. my card setup...

    Thank you ! i have read the manual. my card setup is data port at 00 and status port at 01. how can tx rdy be port 01 ? there is status port. How did you know that rx rdy is port 02 ? can you...
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    RX and TX ready mask ??

    Hello.

    Now, my Imsai 8080 is running on the terminal. I wrote a few small routines to send some stuff to terminal and reverse. I want to burn a machine language monitor to eprom and i have to...
  16. YES YES YES !!! It works !!!!!!!!! :-)))) I have...

    YES YES YES !!! It works !!!!!!!!! :-)))) I have to learn better to clean this old stuff before soldering. I soldered again th baud rate generator. Now, it has signal on clock output to the uarts. I...
  17. Ok. I checked BR2941 baud rate generator. It does...

    Ok. I checked BR2941 baud rate generator. It does not work correctly. Voltage and ground is correct, frequency from oscillator is also correctly now. I have to swap this IC first..


    Jan
  18. So, i removed all ICs. No changes. Then, i made...

    So, i removed all ICs. No changes. Then, i made tape on Pin 20 and Pin 70, now it works. I don´t understand, i cutted the trace to Pin 20 and 70, this did not work.. mmmhhh.. But, i can use the front...
  19. I have forget to say. Pin 20 is cutted together...

    I have forget to say. Pin 20 is cutted together with Pin 70. No, i disconnected (with thin tape) Pin 98, then 99. Always the same.. FPA not working...

    thx

    Jan
  20. Hello. I tried the card without bus drivers....

    Hello.

    I tried the card without bus drivers. Then, i decided me to cut the pin 20 on the interfacer. Then, i removed bus drivers again. Always the same, frontpanel not working. Only RUN/STOP and...
  21. Godbout Interfacer 1 stops Imsai´s front panel...

    Hello.

    I own godbout interfacer 1 serial card. When i mount it to my imsai 8080 motherboard, i cannot examine or deposit anymore. Imsai seems to be blocked out. Now, with my logic probe, i checked...
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    Hello. I fixed the problem. My Imsai works now...

    Hello.

    I fixed the problem. My Imsai works now ! :-)

    At the end, the problem was the U15 7427. The problem was the logic output on Pin 12.

    ...
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    No, all 16 switches were down. Now, it´s 1.20 AM...

    No, all 16 switches were down. Now, it´s 1.20 AM o´clock in germany. I´ll make the measurement tomorrow and let you know.

    Like i said, i wrote small programm C3 00 F0 in memory location 0000....
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    So, i made also the measurement from your last...

    So, i made also the measurement from your last posting. But with all data lines. My logic analyzer has 16 channels.

    Ch0 = pSYNC
    Ch1 = U11-3
    Ch2 = D0
    Ch3 = D1
    Ch4 = D2
    Ch5 = D3
    Ch6 = D4
    Ch7...
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    Hello. I checked again the pin´s from your...

    Hello.

    I checked again the pin´s from your schematic. Now, every signal is fine. Take a look:

    56583

    Then, today i´ve got my ordering of logic chips and my new plug for the flat cable. I...
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